AFMwacc, multiplier, duration

John Sir, Please clarify for me. Dec 2005 Sleepon 1.Appendix 2, for calc of MIRR , multiflier at 11%, where do you get the figures for the years. 2. Appendix 3 , same ques , duration % of total PV 1.0%, 2.4%, 3.3% etc (how do we get these %) formulae please 3. How many Formulae do we have for WACC. and when to use them? one company, 2 company .when we have gearing etc.. Thanks